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This paper presents a permeance network model for use in the dynamic simulation of Switched Reluctance Motors. The modeling is based on the concept to divide the magnetic circuit of the machine in each zone which are described by her own reluctance, therefore we get an equivalent electric circuit and according to laws of ciruits analysis as law of...
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... The NVR method is based on the discretization of the domain to be studied in magnetic zones. The flux tubes cross these zones, and the reluctance of the flux tube thus becomes a quantity, which depends on the geometry of the magnetic circuit and its permeability [20,21]. The study of the VRM by the NVR makes it possible to represent each zone by a single magnetic reluctance Figure 3. ...
span lang="EN-US">The work presented in this paper, proposes a comparison study between the network variable reluctance (NVR) model and the finite elements (FE) model intended for the diagnosis of stator inter-turn short-circuit (ITSC) of the variable reluctance machine (VRM). In the first place, the model of the VRM by the NRV is presented. To validate this model, the FE model of the VRM has been then studied. The detection of the ITSC is achieved by the use of the stator current spectral analysis technique. The simulation results obtained, illustrate well the interest and efficiency of the proposed model as well as of the merits of the stator current spectral analysis technique for the stator ITSC fault diagnosis of the VRM.</span
... EMCN method has long been proven as an effective alternative tool for motor analyses with a much shorter computation time while maintaining the result accuracy close to ones performed by FEM [52][53][54][55][56]. The EMCN model has been used for electrical machine analyses, such as switched reluctance motors [55], asynchronous motors [52], and permanent magnet motors [56]. ...
... EMCN method has long been proven as an effective alternative tool for motor analyses with a much shorter computation time while maintaining the result accuracy close to ones performed by FEM [52][53][54][55][56]. The EMCN model has been used for electrical machine analyses, such as switched reluctance motors [55], asynchronous motors [52], and permanent magnet motors [56]. ...
Classical electrical machines such as asynchronous and permanent magnet synchronous machines have been widely applied in traction applications and particularly in railway traction. This thesis, however, evaluates the contribution of a special class of synchronous machine called Double Excitation Synchronous Machine (DESM) for the railway traction. Double excitation term indicates that the field flux of the machine is created by two sources: excitation windings and permanent magnets. The degree of freedom came from the excitation windings provides the opportunity to work on the energy efficiency improvement target. This thesis will try to answer the question whether DESM is more advantageous over classical machines in a specific driving cycle and additionally, in which circumstances, a DESM performs better.Recent studies have merely optimized the individual components, the major drawback of this approach is that the combination of the best individuals does not necessarily form a best system. In order to achieve more realistic results, a multi-physics model taking into account nonlinear characteristic and various disciplines such as electromagnetic, thermal, mechanical and power electronics will be developed.
... In order to overcome this obstacle, a reluctance network (RN) method provides an alternative solution, which excellently dominates 3-D FEM regarding the computation time. An RN method is widely employed in the electric motor analysis, for example, switched reluctance motors [8], an induction motor [9], and an PM motor [10]. Using RN method is also advantageous compared with the FEM, when there is a need to couple with other analyses, such as thermal or acoustic ones [11]. ...
This paper presents performance improvements of a double excitation synchronous motor by using reluctance network. The distinguishing feature of the double excitation principle is to use permanent magnets with high energy while air-gap flux is flexibly controlled by field windings. Therefore, the first contribution of this paper focuses on maximizing air-gap flux range control. Second, an approach for torque ripple reduction is proposed by directly modifying air-gap flux according to the instantaneous torque profile. The achieved resultant torque stays almost constant for a case study. The validity of the reluctance network method is examined by comparisons with 3D finite element and experimental results for several machines.
... Electromagnetic torque is calculated based on virtual work principle which uses energy variation stored in the area closed by the flux and MMF [20,21] given by (7). This method utilizes phase fluxes and currents which are global quantities instead of local one (used in Maxwell stress tensor method) that usually requires a denser mesh and hence a longer computation time. ...
... π 2 W mp T ∆ = (7) where m is the number of phases, p is the number of pole pairs and ∆W is the co-energy converted per phase over an electrical period. ...
The utilization of nodal based – generalized equivalent magnetic circuit method (EMCM) in the modeling of a double excitation synchronous machine (DESM) is presented in this paper. Nonlinear magnetization characteristic is taken into consideration. This method shows a distinguishing advantage over the finite element method (FEM) in term of computation time. The validity of the EMC results are examined by comparisons with 3D FEM.
... This method with the concept of flux tubes transforms the motor into an equivalent magnetic circuit presented by nodes, reluctances and magneto-motive forces (MMF). RN method is widely employed in electric motor analysis, for example switched reluctance motors [13], induction motor [14] and permanent magnet motor [15]. Using RN method is also advantageous compared to FE method when there is a need to couple with other analyses such as thermal or acoustic ones [16], [17]. ...
This paper presents the reluctance network method used in modeling double excitation synchronous motor. The fringing effect and saturation are taken into account. This method shows its advantage in term of simulation time while maintaining a good accuracy; this fast model will accelerate the optimization process. The comparisons with 3D finite element method and experiment will be also investigated.
... This led to the increased interest in researchers of electrical community as this machine is an attractive solution for worldwide increasing demand of electrical energy. The shortcomings of the conventionally used generators have turned research attention to a more simple and robust variable speed switched reluctance generator (SRG) which exhibits the most desirable features of a generator [1][2][3][4][5][6][7][8][9][10][11][12]. The published literature on switched reluctance generators has dealt with the technical issues related to the machine technology such as generator modeling, design, simulation, analysis and control. ...
Wind power as one of a greatly developed distributed generationtechniques is gaining increasing significance throughout the world. SwitchedReluctance Motor when operated as Generator is proved to be a real alternative toconventional variable speed drives in many applications, especially in the extraction ofmaximum energy in wind energy generation system with the variable wind speeds.This paper reviews the technology status and recent trends of switched reluctancegenerator covering the various aspects of Modeling, Design, Simulation, Analysis andControl.
This paper presents a simple and fast methodology for designing a linear induction motor (LIM). The method consists in expressing the mechanical output parameters of the machine such as the thrust force and power as a function of the progression of the geometric dimensions of a known LIM model chosen as reference. The approach consists in several steps, starting with the choice of prototype, and the analysis of its mechanical characteristics. COMSOL MultiPhysics is an indispensable tool in this research to simulate a multitude of variants, to ensure the magnetization of the machine. Then the operation of a variant of a linear motor was designed. The results obtained are very satisfactory.
Les travaux présentés ici portent sur le dimensionnement et l'étude d'une machine à réluctance variable excitée par un courant continu homopolaire de type``Lyndell´´. De telle structure connaît un regain d'intérêt avec de nouvelles topologies pour des applications spécifiques. Dans le cas des travaux présentés, l'application visée est la conversion d'énergie éolienne avec un stockage inertiel. Cette machine a une bobine d'excitation qui est solidaire du stator et située entre les pôles saillants. Le rotor est massif et comporte deux paires de pôles dont les axes polaires peuvent être parallèles ou perpendiculaires. Le stator possède deux enroulements sur deux demi-stators de machine classique dont l'un est fixe et l'autre orientable manuellement suivant l'axe de rotation du rotor. Cette possibilité d'orientation permet à la machine d'être équipée de l'un ou l'autre des deux types de rotor. Le dimensionnement et l'étude de cette machine sont basés sur le modèle des réseaux de perméances. L'élaboration du modèle, par une subdivision de la structure étudiée en zones à induction homogène, est effectuée à partir de l'analyse des lignes de champ obtenues par la méthode des éléments finis bidimensionnels pour l'ensemble « dent - entrefer - encoche », et les autres parties de la machine (culasse, rotor) sont tridimensionnels. Ces éléments finis constituent également la référence pour valider le modèle développé et pour vérifier le niveau de saturation de la machine. Le modèle par réseaux de réluctance est ensuite utilisé pour dimensionner un prototype, à pôles parallèles ou en quadrature et pour en étudier les performances à vide et en charge. Enfin, le prototype réalisé est étudié pour les deux types de rotor. Les résultats expérimentaux, comparés aux calculs de simulation, montre des concordances très satisfaisantes
This paper deals with the design of a three phase synchronous homopolar machine (SHM) by using the semi analytical method of reluctance modeling. This machine is constituted of two stators and a double massive rotor. The excitation coil is bound with the stator and placed between the two halves of the rotor. The different parts of the machine are represented by reluctance circuits. The reluctance network so developed is resolved by a Saber simulation. This allows finding the optimal dimensions of the machine, while satisfying the condition of an acceptable flux density value, less than 1.8 T in no load operating. Next, torque performances are deduced from reluctance network results. These results are compared with those computed with 3D Comsol finite elements.
